I have been using an new O.S. 15CV-X for about four months, but it has already lost its compression, and won't run after a few minutes when hot now.

I am new to nitros, but I didn't run the motor too lean, it never seemed to get very hot (other cars in the same races were hotter after racing), and glow plugs looked great after running. I have had problems with fuel delivery at times due to leaks in various places, which has made it run lean for a few short periods.

O.S. specifies to run with at least 18% lubricant, but the local hobby shop told me that their 16% lubricant mix was all right, and I have been using that. Could that be the problem?

Can anyone shed some light on this?

I'm getting another O.S. 15CV-X as the speed of my car was awesome, and no-one in my club could beat it in the straight.

Kindest regards,
Chickentrader